Do the undersigned send any money to github? It might be better to phrase your demand in the form of a question, "how much can we pay you to do this work for us?"
GitHub's success is based on its community. Simple fairness says the community should be respected and listened to, simple business says if the community doesn't get something back, it will get pissed and go somewhere else.
GitHub got to where it is today thanks to the network effect that the undersigned helped create. If open source were to do a mass migration to another provider, many of the contributors whom are paying for private repositories and other features would most likely follow.